You might be able to get away with the 1 or 2 ozs, but Duty free does not exempt you from the liquid ban - I just flew back from Australia and there were all these warnings in the duty free that if you bought wine and were flying to the US it would be confiscated at the gate (where they did a very tight search of each person).

Had my fingers crossed for 12,000 miles that the wine in my checked bag would survive and it did